.button {
  position: relative;

  span {
    color: #fff;

    &.position {
      position: relative;
      top: 5px;
      left: 10px;
    }
  }

  i {
    display: block;
    position: relative;
    border: 1px solid rgb(0, 0, 0);
    border-radius: 50%;

    &:before,
    &:after {
      content: '';
      display: block;
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      border-radius: 50%;
      box-shadow: 0 5px 10px rgba(255, 255, 255, .8) inset;
    }

    &:after {
      box-shadow: 0 -5px 10px rgba(0, 0, 0, .8) inset;
    }

    &.active {
      &:before {
        box-shadow: 0 -3px 6px rgba(255, 255, 255, .6) inset;
      }

      &:after {
        box-shadow: 0 5px 5px rgba(0, 0, 0, .6) inset;
      }
    }
    box-shadow: 0 3px 3px rgba(0, 0, 0, .2);
  }

  &.blue i {
    background: #0088ff;
  }

  &.small i {
    width: 52px;
    height: 52px;
  }
}